Fibre-optics implementation of asymmetric phase-covariant quantum cloner

Details Fibre-optics implementation of asymmetric phase-covariant quantum cloner Fibre-optics implementation of asymmetric phase-covariant quantum cloner

2006-12-14

arxiv.org/abs/quant-ph/0612119v1

Phys. Rev. Lett. 99, 120505 (2007).

Physics

Quantum Physics

4 pages, 3 figures, RevTeX4

Scientific paper

10.1103/PhysRevLett.99.120505

We present the experimental realization of optimal symmetric and asymmetric phase-covariant 1->2 cloning of qubit states using fiber optics. State of each qubit is encoded into a single photon which can propagate through two optical fibers. The operation of our device is based on one- and two-photon interference. We have demonstrated creation of two copies of any state of a qubit from the equator of the Bloch sphere. The measured fidelities of both copies are close to the theoretical values and they surpass the theoretical maximum obtainable with the universal cloner.

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